Preamp popping!


Salutations! 

I have a problem and was hoping to use our collective experience to solve it..

My preamp (dared mc-7p) produces a VERY loud pop through the speakers approximately 10-30 seconds after I power it up. I'm now concerned about blowing a tweeter. I can even see the 12" woofers move.

Obviously I can just turn the dared on first, then turn the amp on after a minute or so. But that's just hiding the problem. I'd like to solve it..

Ideas? I've tried nothing yet. My first inking is to try replacing tubes.. Good idea? If so, shall I start with the power or signal tubes? Again, my inkling is to start with power.

Assuming that doesn't work.. What else could it be? Some kind of capacitor gone bad?
128x128toddverrone
@minorl right? I knew something was wrong because it didn’t pop like that normally and everyone is telling me I’m turning things on in the wrong order... I'm glad you caught that. I was wondering if I’d lost my ability to communicate

10-30 seconds was the kicker.... That and no tube preamp I have ever owned popped at start up.

rodman99999
2,875 posts
01-19-2017 2:23pm
@escritorjuan - Don’t know who gave you that advice(amp on first/off last), BUT- Don’t ever take any advice from them again!

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I was borrowing my mentors mobile DJ rig and talking on the phone with him as I powered up his amp (the mixer/preamp and dual CD player were already on). A loud POP burst over the speakers. Needless to say, he was not happy! That’s when he gave me his advice.

Now, this was a powerful pro Crown amp. With that gear (and my DJ gear, with its 550 watt Crown PB-3 amp), this was the correct approach.




Its funny. I used to think the amp was before the preamp in the power up sequence during the entire 25+ years I owned my Adcom separates and never heard a pop or had any issues, not even a blown fuse. The first time I heard about the "correct" power up sequence was from reading it in this forum.